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Submitted on: 23 May 2004.
Revised on: 23 August 2004.
Accepted on: 10 September 2004.
___________________AQUATIC ECOLOGY---SPRINGER
Submitted on: 09 July 2013.
Revised on: 06 September 2013.
Accepted on: 09 October 2013.
___________________AQUATIC ECOLOGY---SPRINGER
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